150 lines
5.7 KiB
Python
150 lines
5.7 KiB
Python
from supermutes.dot import dotify
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from chartbuilder import ChartBuilder
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from tiller import Tiller
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from logutil import LOG
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import yaml
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import difflib
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class Armada(object):
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'''
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This is the main Armada class handling the Armada
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workflows
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'''
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def __init__(self, args):
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'''
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Initialize the Armada Engine and establish
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a connection to Tiller
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'''
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self.args = args
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# internalize config
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self.config = yaml.load(open(args.config).read())
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self.tiller = Tiller()
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def find_release_chart(self, known_releases, name):
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'''
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Find a release given a list of known_releases and a release name
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'''
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for chart_name, version, chart, values in known_releases:
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if chart_name == name:
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return chart, values
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def sync(self):
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'''
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Syncronize Helm with the Armada Config(s)
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'''
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# extract known charts on tiller right now
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known_releases = self.tiller.list_charts()
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prefix = self.config.get('armada').get('release_prefix')
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for release in known_releases:
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LOG.debug("Release %s, Version %s found on tiller", release[0],
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release[1])
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for entry in self.config['armada']['charts']:
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chart = dotify(entry['chart'])
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values = entry['chart']['values']
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pre_actions = {}
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post_actions = {}
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if chart.release_name is None:
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continue
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# initialize helm chart and request a
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# protoc helm chart object which will
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# pull the sources down and walk the
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# dependencies
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chartbuilder = ChartBuilder(chart)
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protoc_chart = chartbuilder.get_helm_chart()
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# determine install or upgrade by examining known releases
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LOG.debug("RELEASE: %s", chart.release_name)
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if chart.release_name in [x[0] for x in known_releases]:
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# indicate to the end user what path we are taking
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LOG.info("Upgrading release %s", chart.release_name)
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# extract the installed chart and installed values from the
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# latest release so we can compare to the intended state
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installed_chart, installed_values = self.find_release_chart(
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known_releases, chart.release_name)
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if not self.args.disable_update_pre:
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pre_actions = getattr(chart.upgrade, 'pre', {})
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if not self.args.disable_update_post:
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post_actions = getattr(chart.upgrade, 'post', {})
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# show delta for both the chart templates and the chart values
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# TODO(alanmeadows) account for .files differences
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# once we support those
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upgrade_diff = self.show_diff(chart, installed_chart,
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installed_values,
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chartbuilder.dump(), values)
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if not upgrade_diff:
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LOG.info("There are no updates found in this chart")
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continue
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# do actual update
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self.tiller.update_release(protoc_chart, self.args.dry_run,
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chart.release_name, chart.namespace,
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pre_actions, post_actions,
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disable_hooks=chart.
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upgrade.no_hooks,
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values=yaml.safe_dump(values))
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# process install
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else:
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try:
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LOG.info("Installing release %s", chart.release_name)
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self.tiller.install_release(protoc_chart,
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self.args.dry_run,
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chart.release_name,
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chart.namespace,
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values=yaml.safe_dump(values))
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except Exception:
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LOG.error("Install failed, continuing.")
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LOG.debug("Cleaning up chart source in %s",
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chartbuilder.source_directory)
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chartbuilder.source_cleanup()
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if self.args.enable_chart_cleanup:
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self.tiller.chart_cleanup(prefix, self.config['armada']['charts'],
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known_releases)
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def show_diff(self, chart, installed_chart,
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installed_values, target_chart, target_values):
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'''
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Produce a unified diff of the installed chart vs our intention
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TODO(alanmeadows): This needs to be rewritten to produce better
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unified diff output and avoid the use of print
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'''
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chart_diff = list(difflib.unified_diff(installed_chart
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.SerializeToString()
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.split('\n'),
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target_chart.split('\n')))
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if len(chart_diff) > 0:
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LOG.info("Chart Unified Diff (%s)", chart.release_name)
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for line in chart_diff:
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LOG.debug(line)
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values_diff = list(difflib.unified_diff(installed_values.split('\n'),
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yaml
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.safe_dump(target_values)
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.split('\n')))
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if len(values_diff) > 0:
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LOG.info("Values Unified Diff (%s)", chart.release_name)
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for line in values_diff:
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LOG.debug(line)
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return (len(chart_diff) > 0) or (len(chart_diff) > 0)
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